Microsoft researcher found Apple 0-day in March, didn’t report it

Yesterday, we wrote about a vaguely mysterious zero-day patch pushed out by Apple.

Like almost all Apple security fixes, the update arrived without any sort of warning, but unlike most Apple updates, only a single bug was listed on the “fix list,” and even by Apple’s brisk and efficient bug-listing standards, the information published was thin.

The update was issued only for the very latest supported incarnations of iOS, iPadOS and macOS (major release numbers iOS/iPadOS 14 and macOS 11).

Older but still-supported versions of iOS and macOS (iOS 12, as well as macOS 10.15 Catalina and 10.14 Mojave), along with watchOS and tvOS, didn’t get a mention at all.

Whether those not-yet-patched versions are vulnerable but are proving harder to fix, are vulnerable but simply aren’t going to be fixed, or don’t actually contain the buggy code at all, we aren’t yet sure.

This lone bug is known only by the impersonal, database-issued name of CVE-2021-30807, and is attributed to “an anonymous researcher”.

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